As regards the gospel, they are enemies for your sake. But as regards election, they are beloved for the sake of their forefathers. For the gifts and the calling of God are irrevocable. Romans 11:28-29

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But from there you will seek the LORD your God and you will find him, if you search after him with all your heart and with all your soul. When you are in tribulation, and all these things come upon you in the latter days, you will return to the LORD your God and obey his voice. For the LORD your God is a merciful God. He will not leave you or destroy you or forget the covenant with your fathers that he swore to them. Deuteronomy 4:29-31

Yet for all that, when they are in the land of their enemies, I will not spurn them, neither will I abhor them so as to destroy them utterly and break my covenant with them, for I am the LORD their God. But I will for their sake remember the covenant with their forefathers, whom I brought out of the land of Egypt in the sight of the nations, that I might be their God: I am the LORD.” Leviticus 26:44-45